Small Indexing Plunger with Circle Plastic Clamping Knob, M16 x 12mm, D33, pin8
PSK300-331612N0810
Mini spring loaded pull pin, Tiny indexing plunger, Pop pin
Enhance your product’s form factor by swapping in this slender plunger. If your small AV or sports equipment needs an easy-to-use, flexible plunger, Our mini plungers incorporate M8–M16 plus 4–10mm pins. The knob features a ring plus four styles, with 7 ring/disc colors for branding; wood fiber or oyster shell plastic supports eco goals. Taiwan CNC and mold prowess ensures precise, durable locking, while ISO9001 processes fulfill bulk or custom B2B demands in medical, automotive-aerospace, semiconductors, or specialized machinery.
Function
UJEN Mini Spring Pull Pins are ideal for applications requiring compact size, frequent adjustment, and quick fastening. Simply pull the compact knob upward to release the pin from its hole, adjust the component to your desired position, and release—the internal spring immediately re-engages the pin for precise positioning.
Additionally, this pull pin features a special knob design allowing manual rotation to tighten screws directly by hand, ensuring stable clamping and preventing component vibration or loosening without needing tools. Perfectly suited for fitness equipment, medical devices, mechanical assemblies, and furniture hardware.
Features
- RoHS REACH compliant.
- Pull and release process smoother.
- Thread is class 2.
- Flame-proof, heat-resistant, anti-UV properties.
- The head knob has a matte finish.
- The head knob does not hurt hands, no sharp angles or burrs.
- The knob is easy to tight with a hand. the best design of beauty and grip.
- The metal is shiny and detailed.
- Zinc plated metal, stable corrosion resistance.
- The fitting tolerance between metal parts is small, reducing sway.
- The rounded corner of the Plunger's front end increases smoothness of insertion.
- The chamfered front end of the screw makes assembly smoother and reduces wear on the mating end face.
Dimensions

Thread Size
- M16
Thread Material
- Steel
Screw Length(mm/inch)
- 12 / 0.47
Plunger Diameter(mm)
- 8
Metal Finishing
- zinc plated with trivalent
External Diameter(mm)
- 33~36
External Height(mm)
- 33~36
External Material
- PA6+GF
External Shape
- Circle
Gallery
- Customized service for Bolt, Screw & Nut (metal parts)
- The center pin can be fitted with an anti-scratch pad to minimize scratches on the surface of the locked object.
- Optional accessories of knobs, handles, pull pins
- Related Products
Small Indexing Plunger with Circle Plastic Clamping Knob, rest position, M16 x 12mm, D33, pin8
PSK300F-331612N0810
Keeps production lines moving by preventing repeated manual pin engagement. In many compact...
Details Add to ListSmall Indexing Plunger with Circle Plastic Clamping Knob, rest position, M16 x 1.5 x 12mm, D33, pin8
PSK300F-3316120810
Reduces workload for technicians who frequently reposition pinned mechanisms. Many automation...
Details Add to ListSmall Indexing Plunger with Circle Plastic Clamping Knob, M16 x 1.5 x 12mm, D33, pin8
PSK300-3316120810
Simplify your BOM by specifying this all-in-one mini plunger solution. For delicate specs in semiconductor...
Details Add to List- FAQ
How to choose the right hand-fasten screw for your needs?
Selecting the suitable hand-tighten screw involves considering several factors, including the application environment (such as temperature, humidity, chemical...
Can I request customized materials or colors for hand-fasten screws?
Yes, we offer comprehensive customization services, including material selection, color, size, and surface treatment for hand-turned screws. Whether you need...
What quality assurances come with purchasing UJEN's thumb screws?
We provide comprehensive quality guarantees for all our handle screws. Every batch of handle screws undergoes strict quality testing to ensure it meets...
How are order logistics and delivery issues handled after placing an order?
We cooperate with several professional logistics companies to ensure safe and rapid delivery of products to our clients. Regardless of your location around...
If we need technical support, what assistance can UJEN provide?
We offer comprehensive technical support, including knob screw selection advice, installation guidance, and performance optimization. You can contact our technical...
Small Indexing Plunger with Circle Plastic Clamping Knob, M16 x 12mm, D33, pin8 | Achieve Ergonomic Efficiency with Adjustable Handles for Machinery
Based in Taiwan since 1994, UJEN DEVELOPMENT CO., LTD. expertise in manufacturing high-quality Small Indexing Plunger with Circle Plastic Clamping Knob, M16 x 12mm, D33, pin8, hand screws, knob screws, adjustable handles, grip knobs, and indexing plungers. Their commitment to customization and precision ensures each component, from hand screws to indexing plungers, meets rigorous standards. This dedication positions UJEN as a leader in supplying durable and reliable industrial components to global markets.
UJEN Development Co., Ltd. is a leading manufacturer of precision-engineered hand screws, knob screws, plastic knobs, adjustable handles, and indexing plungers for a variety of industrial needs. Our 45-year legacy, combined with ISO 9001:2015 certification, underscores our commitment to quality, innovation, and customer satisfaction. Specializing in custom solutions, we excel in professional moldmaking, enhancing equipment functionality across industries.
UJEN has been offering customers high-quality hand screws for industrial machinery since 1994, both with advanced technology and 47 years of experiences, UJEN ensures each customer's demands are met.







